薄い軟鋼板の突合せ溶接時の過渡応力と開先の変位挙動に関する研究 : 第3報 : 終端仮付けに働く最大引張力について

概要

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In the previous reports, it has been shown that transverse forces acting on tack welds and deformation behavior of groove during butt-welding varied with sizes of welded plates and welding conditions significantly. The purpose of this report is to clarify effects of plate width, length of weld, tack weld pitch and welding condition on the maximum tensile force acting on a finishing end tack weld and to propose a suitable method to predict the maximum tensile force which is a primary factor of end cracking of butt-welding joints. A series of numerical calculations is performed based on unsteady heat conduction analysis and uncoupled elasto-plastic thermal stress analysis by use of the finite element method. Effect of mesh subdivision on accuracy of calculated results is carefully examined. It is suggested that use of a small time increment and a mesh size proportionate to weld heat input is necessary to acquire satisfactory results. An approximate formula to estimate the maximum tensile force acting on a finishing end tack weld is proposed. It is shown that the estimated values are fairly in good agreements with the calculated and/or measured values obtained hitherto, and that if we consider the optimum average width of fused zone for a welded joint with a given size, the maximum tensile force is specified only by welding speeds and becomes maximum for a specific welding speed.
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